Jar and safety joint



June 1951 5.M. HOWARb 2,557,349

' JAR AND SAFETY JOINT Filed June 20, 1947 I 3mm Clifford [7; Howard.

Patented June 19, 1951 UNITED STATES PATENT OFFICE AND SAFETY JOINT Clifford M. iioward, Fontana, Calif. A piieaiion June 20, 1947*, serial No. 756.061

7 Claims; (01.- zen-27 This invention relates to an oil well tool adapted to be coupled on to a lost section of pipe termed a fish; and means is provided in the tool to jar upwardly to loosen the lost pipe when a tension is applied to the tool.

An object of my invention is to provide a novel jar and safety joint including a novel means to release the mandrel when tension is applied to the mandrel, thus creating a bump or jar upwardly to assist in loosening the lost pipe or fish.

Another object of my invention is to provide a novel jar and safety joint including a means of releasing the tool after it is attached to the fish, if the fish cannot be loosened and brought to the surface.

A feature of my invention is to provide a tool of the character stated including a novel latching means to releasably hold the mandrel in one position and permit a sudden release of the man'- drel under tension and thereby imparting a jar to the fish when the mandrel strikes a shoulder.

Another feature of my invention is to provide a tool of the character stated which is simple in construction, effective in operation and which can be quickly and easily repaired when neces-- sary.

Other objects, advantages and features of in= vention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing:

Figure 1 is a longitudinal sectional view of my jar and safety joint.

Figure 2 is a sectional view taken on line 2 2 of Figure 1.

Figure 3 is a sectional View taken on line 3- 3 of Figure 1.

Figure 4 is a sectional view taken on line 4--4 of Figure 1.

Figure 5 is a sectional view taken on line 5-5 of Figure l.

Referring more particularly to the drawing, the numeral I indicates a mandrel which is threaded at the upper end, as shown at 2, so that the mandrel may be attached to a string of pipe and lowered into the wen, all of whieh is usual and well known. The mandrel I extends into a housing 3 which includes a gland 4 at the upper end thereof. The gland 4 screws into a case 5, the case inturn screwing into or on to asleeve 6 and the sleeve 6 is threaded to a sub 1. Packing 8 is inserted in the gland 4 and around the mandrel I to pack oil the top of the tool.

A ring 9 screws on to the mandrel I and in the raised position of the mandrel this ring strikes against a shoulder ID in the gland i to create the bump or jar, all of which will be further described. The ring 9 moves longitudinal in the housing 3 with the mandrel I, the lower-most position of the ring and the mandrel being limited by a shoulder II in the case 5. The ring 9 is formed with a longitudinal groove I2, and a notch I3 on one side of the groove. As here shown, there are two of the grooves I2 and two notches I3 arranged one on each side of the ring 9 I V I A sleeve I 4 surrounds the ring 9 and is provided with a lug l5 which extends into the notch [3 when the mandrel I is moved downwardly. The sleeve I4 can rotate but it cannot move vertically. The sleeve I4 is held with the lug I5 pressed into the notch I3 in the following manner:

I A collar It is slidablymounted on the mandrel I belowthe sleeve I4. This collar is provided with fingers I1 which extend upwardly through the slot IS in the case 5. The collar It is pressed upwardly by the spring I9 which bears against the bottor'n of the collar. It will thus be evident that the collar I6 is yieldably forced up wardly, urging the finger I1 into a cam notch 26 in the bottom of the sleeve 4. The lug I5 and the notch I3 into which it falls, are both tapered and when the mandrel I is pulledupwardly, there is a tendency to cam thesleeve I4 out of engagement with the ring S; that is, upward force on the mandrel I will tend to rotate the sleeve I4 and disengage the lug I5 from the notch 53. The rotative movement of the sleeve I l is opposed by the finger ll when this finger extends into the cam notch 20. The upper end of the finger istapered as shown at 2i and the rotating action of the sleeve I l will tend to cam the fin;- ger I! out of the notch 20, pushing the collar It downwardly against the tension of the spring I9. Whenthe upward pull on the mandrel I becomes great enough. the collar IE will be pushed downwardly, the sleeve It will then be permitted to rotate and the lug I5 will be forced out of the notch I3, thus releasing the mandrel and causing it to moveupwardly until the ring 9 strikes the shoulder I-Il, thus causing a jar or bump on the fish.

The lower end of the sub 1 is threaded as shown at 22, these threads being adapted to screw into the top of the lost pipe. The sub I also screws on to the bottom of the sleeve 6 with left hand threads 23. When the tool is run into the well, the mandrel is pushed downwardly until the splines 24 enter the grooves 25 in the sub 1. In

this position of the parts, the mandrel can be rotated by the pipe to which it is attached, thus screwing the sub into the lost pipe. The bumping or jarring action will then be carried out as described above.

If the lost pipe cannot be recovered, the man drel 24 is pulled upwardly to the position shown in Figure 1, and with the splines 24 out of the grooves 25, and the right hand rotation of the mandrel I will unscrew the threads 23 and the tool as well as the pipe to which it is attached, can be recovered. This last action is carried out only if the lost pipe cannot be loosened and cannot be recovered.

A shear ring 26 encircles the mandrel i above the ring 9, this shear ring will engage the shoulder l0 and will hold the mandrel l in a lowered position so that the splines 24 are at least partly engaging the splines 25., The purpose of this arrangement is to be sure that the sub 1 will not be unscrewed accidently or unintentionally, particularly while the tool is being run into the well. As soon as the bumping or jarring operation commences, the ring 26 will shear off, and then the parts can rise to the position shown in Figure 1, and as previously described, the sub 1 may be unscrewed, if necessary.

Having described my invention, I claim:

1. A jar and safety joint comprising a mandrel, a housing into which said mandrel extends, a sub on the lower end of said housing, means on the sub engageable with a lost pipe, a sleeve rotatably mounted in the housing a lug on the inside of the sleeve, means on the mandrel engageable by the lug on the sleeve, and releasable on the upward pull on the mandrel, and releasable means in the housing engaging said sleeve, said releasable means opposing the rotation of said sleeve when engaging the sleeve, and means on the lower end of said mandrel engageable with said sub in the lowered position of said mandrel.

2. A jar and safety joint comprising a mandrel, a housing into which said mandrel extends, a sub on the lower end of said housing, means on the sub engageable with a lost pipe, a sleeve rotatably mounted in the housing a lug on the inside of the sleeve, means on the mandrel engageable by the lug on the sleeve, and releasable on the upward pull on the mandrel, and releasable means in the housing engaging said sleeve, said releasable means opposing the rotation of said sleeve when engaging the sleeve, and spring means bearing against said last named means and urging said last named means into engagement with the sleeve, and tending to maintain said last named means in engagement with said sleeve, and means on the lower end of said mandrel engageable with said sub in the lowered position of said mandrel.

3. A jar and safety joint comprising a mandrel, a housing into which said mandrel extends a ring on the mandrel, a sleeve rotatably mounted in said housing, said ring having a notch formed therein, a. lug on the sleeve, engageable with said notch and releasable therefrom on rotation of the sleeve, and means releasably engaging said sleeve and tending to restrain said sleeve against rotative movement.

4. A jar and safety joint comprising a mandrel,

4 a housing into which said mandrel extends, a sleeve rotatably mounted in said housing a ring on the mandrel, said ring having a notch formed therein, a lug on the sleeve engageable with said notch and releasable therefrom on rotation of the sleeve, a collar mounted in said housing for vertical movement, a cam finger on said collar, said sleeve having a cam notch therein to receive said finger and spring means bearing against said collar and pressing said finger into said cam notch.

5. A jar and safety joint comprising a mandrel, a housing into which said mandrel extends said mandrel being vertically movable in the housing, a sleeve rotatably mounted in said housing a ring on the mandrel, said ring having a notch formed therein, a lug on the sleeve engageable with said notch and releasable therefrom on rotation of the sleeve, a'collar mounted in said housing for vertical movement, a cam finger on said collar, said sleeve having a cam notch therein to receive said finger and spring means bearing against said collar and pressing said finger into said cam notch, and means on the lower end of said mandrel engageable with said sub in one position of the mandrel, whereby said sub is driven with said mandrel.

6. A jar and safety joint comprising a mandrel, a housing into which said mandrel extends said mandrel being vertically movable in the housing, a sleeve rotatably mounted in said housing a ring on the mandrel, said ring having a notch formed therein, a lug on the sleeve engageable with said notch and releasable therefrom on rotation of the sleeve, a collar mounted in said housing for vertical movement, a cam finger on said collar, said sleeve having a cam notch therein toreceive said finger and spring means bearing against said collar and pressing said finger into said cam notch, and means on the lower end of said mandrel engageable with said sub in one position of the mandrel, whereby said sub is driven with said mandrel, said sub being threaded on to the lower end of said housing.

7. A jar and safety joint comprising a mandrel,

, a housing into which said mandrel extends, a

sub threaded on to the lower end of said housing, said sub having grooves therein to receive splines on the mandrel a ring on the mandrel, said ring having a cam notch therein, a sleeve rotatably mounted in the housing, a lug on the sleeve adapted to fit into said cam notch in the ring, a collar on the mandrel said collar being mounted for vertical movement in the housing and held against rotation relative to the housing, a spring bearing against the collar, said sleeve having a notch therein and a cam finger projecting from the collar, and entering said cam notch in the sleeve wherebyv said sleeve is releasably held against rotation.

CLIFFORD M, HOWARD.

REFERENCES CITED The following references are of record in the file of this patent:

UNTIED STATES PATENTS 

